一种从植物中提取的天然化合物α - damascone可用于制作“香水”,其结构

题型:选择题

问题:

一种从植物中提取的天然化合物α - damascone可用于制作“香水”,其结构为:

有关该化合物的下列说法不正确的是[ ]

A.分子式为C13H20O

B.该化合物可发生聚合反应

C.1 moI该化合物完全燃烧消耗19 moI O2

D.与溴的CCl4溶液反应生成的产物经水解、稀硝酸酸化后可用AgNO3溶液检验

考点:醛的通性
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以一个被保险人生存作为年金给付条件的年金保险称为______。

A.最后生存者年金
B.联合年金
C.联合及生存者年金
D.个人年金

题型:选择题

含挥发油的饮片易()

A.散失气味

B.虫蛀、霉变

C.泛油、酸败

D.风化、潮解

E.变色、软化

题型:选择题

下面关于股份公司的论述,正确的是( )。

A.股份公司使所有权和使用权进一步分离

B.股份公司是资本主义生产关系内部的一种调整

C.股份公司是社会化大生产的产物

D.股份公司是一种企业组织形式,资本主义可以用,社会主义也可以用

题型:选择题

在密闭容器中有甲、乙、丙、丁四种物质,

在一定条件下反应,测得反应前后各物质的质量分数如图所示。下列说法正确的是:

A.丙可能是单质

B.若消耗3 g的乙,则生成17 g的丙

C.丁一定是该反应的催化剂

D.甲、乙的质量之和一定等于生成丙的质量

题型:选择题

Passage twoEducating girls quite possibly yields a higher rate of return than any other investment available in the developing world .women’s education may be unusual territory for economists ,but enhancing women’s contribution to development is actually as much an economic as a social issue .and economics ,with its emphasis on incentives ,provides guideposts that point to an explanation for why so many girls are deprived of an education Parents in low-income countries fail to invest in their daughters because they do not expert them to make an economic contribution to he family :girls grow up only to marry into somebody else’s family and bear children .Girls are thus seen as less valuable than boys and kept at home to do housework while their brothers are sent to school-the prophecy becomes self-fulfilling ,trapping women in a vicious circle of neglect. An educated mother ,on the other hand ,has greater earning abilities outside the home and faces an entirely different set of choices. She is likely to have fewer but healthier children and can insist on the development of all her children ,ensuring that her daughters are given a fair chance .The education of her daughters then makes it much more likely that the next generation of girls ,as well as of boys ,will be education and healthy . The vicious circle is thus transformed into a virtuous circle. Few will dispute that education women has great social benefits.But it has enormous economic advantages as well .Most obviously ,there is the direct effect of education on the wages of female workers.Wages rise by 10 to 20 percent for each additional year of schooling. Such big returns are impressive by the standard of other available investments ,but they are just the beginning .Education women also has a significant impact on health practices,including family planning.

The author believes that a vicious circle can turn into a virtuous circle when ()

A.women care more about education

B.girls can gain equal access to education

C. a family has fewer but healthier children

D.parents can afford their daughters’education

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